The Siemens 3RP1525-1AQ308K is an on-delay electronic timer from the Siemens 3RP series, designed for industrial automation, machine-control panels and electrical control systems. It features 1 changeover contact (1 C/O) and a wide adjustable timing range of 0.05 seconds to 100 hours across 15 time-setting ranges. Siemens product information identifies the 3RP1525-1AQ30 family as an on-delay electronic timing relay with 1 changeover contact and screw terminals.
The 3RP1525-1AQ308K is part of the Siemens 3RP electronic timer family, used to introduce controlled time delays into industrial control circuits.
Electronic timers can coordinate the operation of:
Contactors
Relays
Motors
Pumps
Fans
Valves
Conveyors
Production equipment
Machine sequences
Process-control systems
This makes the timer useful for conventional electrical control panels as well as industrial automation applications.
The main function of the 3RP1525-1AQ308K is on-delay timing.
With an on-delay timer, the timing period begins when the control signal is applied. The output changes to its operated state only after the selected time has elapsed.
A simplified sequence is:
Control Signal ON → Preset Time Delay → Output Operates
This is useful when one machine operation needs to begin only after another condition has remained active for a defined period.
Typical applications include:
Delayed motor starting
Delayed contactor energization
Conveyor sequencing
Pump-control sequences
Fan-control applications
Machine sequencing
Process timing
Auxiliary control circuits
One of the important advantages of the 3RP1525-1AQ308K is its broad timing range of 0.05 seconds to 100 hours, with 15 selectable time ranges.
This gives panel builders and automation engineers flexibility for both short timing operations and longer industrial process delays.
The required timing range should be selected according to the machine sequence and application requirements.
The product is specified with 1 C/O contact, also known as a changeover contact.
A changeover contact provides a common terminal with normally open and normally closed paths, giving the timer flexibility in different control circuits.
It can be used for:
Contactor control
Relay logic
PLC inputs
Interlocking
Status signalling
Sequence control
Auxiliary switching
Control-system feedback
The connected load should remain within the applicable contact ratings.
The 3RP1525-1AQ308K configuration is specified for 24/100–127 V AC and 24 V DC control supply. The Siemens listing identifies the control supply as AC/DC, with AC operation at 50/60 Hz.
This makes it suitable for control systems using the specified low-voltage AC or DC supplies.
Always verify the actual control voltage against the product marking and installation requirements.
The Siemens 3RP1525-1AQ30 family uses screw terminals, providing a familiar connection method for industrial control panels and electrical cabinets.
This can support straightforward wiring, commissioning and maintenance when the timer is installed according to the manufacturer's instructions.
The 3RP1525-1AQ308K can be used wherever controlled time delays are required in an industrial control sequence.
Typical applications include:
The timer can introduce a delay before a motor contactor or auxiliary control device is energized.
It can coordinate starting or sequencing between different conveyor sections or machine stages.
The timer can provide delayed activation where pump operation must follow another control event.
It can be used for controlled activation after a predefined delay.
The timer can coordinate multiple stages of an automated machine sequence.
It can introduce timing between different stages of a production or process-control sequence.
The 3RP1525-1AQ308K is suitable for OEM machine manufacturers, electrical panel builders, automation integrators and industrial maintenance professionals.
Its combination of on-delay functionality, 1 C/O contact and an extensive 0.05-second to 100-hour timing range makes it useful for a wide variety of machine and process-control applications.
Siemens 3RP electronic timer
Article number 3RP1525-1AQ308K
On-delay timing function
1 C/O changeover contact
0.05 second to 100 hour timing range
15 selectable time ranges
24/100–127 V AC input
24 V DC input
Screw terminals
Suitable for industrial automation
Suitable for machine-control panels
Suitable for relay and contactor control
Suitable for OEM machinery
Suitable for process-control applications
Wide timing range: Supports applications from very short delays to long process intervals.
15 time ranges: Provides flexibility for different industrial timing requirements.
On-delay operation: Delays output switching until the selected time has elapsed.
1 C/O contact: Provides flexible switching options.
AC/DC control compatibility: Supports the specified 24 V DC and AC input configurations.
Easy panel integration: Screw terminals provide a familiar industrial connection method.
Sequence control: Helps coordinate different machine and process operations.
OEM-friendly: Suitable for standardized industrial control-panel designs.
The Siemens 3RP1525-1AQ308K provides a flexible on-delay timing solution for industrial control and automation applications.
Its 0.05-second to 100-hour timing range, 15 selectable time ranges and 1 C/O changeover contact allow it to support a wide variety of timing requirements, from delayed motor starting to longer process-control sequences.
For OEMs, panel builders and automation integrators, it offers a practical solution for delayed switching, machine sequencing, relay logic and process timing.
SB Smart supplies Siemens industrial electrical and automation products across Faridabad, Gurgaon/Gurugram, Delhi NCR, Haryana, Noida, Punjab, Mumbai and all major cities across India.
Major delivery locations include:
Faridabad
Gurgaon/Gurugram
Delhi
Delhi NCR
Noida
Greater Noida
Haryana
Punjab
Mumbai
Pune
Ahmedabad
Bengaluru
Hyderabad
Chennai
Kolkata
Jaipur
Chandigarh
Lucknow
Indore
Surat
Vadodara
Nagpur
Coimbatore
And other major cities across India
It is a Siemens 3RP on-delay electronic timer with 1 C/O changeover contact.
The timer provides a selectable range of 0.05 seconds to 100 hours across 15 time ranges.
On-delay means the timer waits for the selected period after the control signal is applied before changing the output to its operated state.
It has 1 C/O changeover contact.
The 3RP1525-1AQ308K is specified for 24/100–127 V AC and 24 V DC input.
Yes, the 3RP1525-1AQ30 family uses screw terminals.
It can be used in motor-control panels, pumps, fans, conveyors, production machinery, packaging systems and process-control applications.
Common applications include delayed motor starting, conveyor sequencing, pump control, fan control, machine sequencing and process timing.
Yes. Its changeover contact can be incorporated into a suitable contactor-control circuit, provided the electrical ratings are compatible.
You can explore the Siemens product range at SB Smart for Siemens electronic timers, contactors, relays and other industrial automation products.
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| Specification | Details |
|---|---|
| Product Name | Electronic On-Delay Timer Relay |
| Manufacturer | Siemens |
| Series | SIRIUS 3RP |
| Model Number | 3RP1525-1AQ308K |
| SKU | 3RP1525-1AQ308K |
| Product Type | On-Delay Timer |
| Timing Function | On-Delay |
| Contact Configuration | 1 Changeover Contact (1 C/O) |
| Time Range | 0.05 Seconds to 100 Hours |
| Number of Time Ranges | 15 Selectable Ranges |
| Control Supply Voltage | 24V AC / 100–127V AC / 24V DC |
| Voltage Type | AC/DC |
| Frequency | 50/60 Hz |
| Repeat Accuracy | < ±1% |
| Setting Accuracy | < ±5% |
| Mounting Type | 35 mm DIN Rail Mounting |
| Housing Width | 22.5 mm |
| Terminal Type | Screw Terminals |
| Status Indication | LED Indicators |
| Protection Rating | IP20 |
| Thermal Current | 5 A |
| Contact Material | AgSnO₂ (Silver Tin Oxide) |
| Mechanical Endurance | Up to 10 Million Operations |
| Application | Delayed Switching & Automation Control |
| Product Family | Siemens SIRIUS Timing Relays |
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